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Trustworthy timestamps and certifiable clocks using logs linked by cryptographic hashes
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a cryptographic hash and certifiable technology, applied in the field of document processing, can solve the problems of centralized methods that are impossible, clocks which may be inaccurate, and by itself do not allow the accuracy of an ntp-generated timestamp to be verified
Active Publication Date: 2012-01-19
RICOH KK
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Problems solved by technology
Peer-to-peer systems, decentralized version-control systems like “git” and other decentralized systems make centralized methods impossible.
Separate devices have their own clocks, which may be inaccurate, and keep their own logs.
However, it only allows the NTP client to accurately determine the current time.
This by itself does not allow the accuracy of an NTP-generated timestamp to be verified at a later date.
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[0018]A method and apparatus for providing trustworthy timestamps and certifiable clocks using logs linked by cryptographic hashes is described. In one embodiment, devices maintain a hash-connected time log and use it to timestamp (entangle) its other log entries. When two devices meet to exchange log information, they can synchronize their time logs. That is, each device makes a time-stamped log entry that contains the other log's time and log hash. This forms a “web of trust.” Thus, by exchanging the running hash, the logs are entangled, thereby yielding a partial ordering on log entries (e.g., versions, events, etc.) that represents causal ordering. In one embodiment, the entangled log is used to prove, for example, which documents or events were seen by a given device at the time a particular log entry was made.
[0019]In one embodiment, each device places bounds on their clock's accuracy, depending on its assessment of the other device's accuracy, and this in turn bounds the accu...
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Abstract
A method and apparatus for creating and / or using trustworthy timestamps and certifiable clocks using logs linked by cryptographic hashes. In one embodiment, the method comprises maintaining a first, chained-hash log; associating a first clock with the chained-hash log, and entangling the first log; with a second by adding a time-stamped synchronization entry to the chained-hash log, where the synchronization entry has a second time indication associated with the second log and a hash of one or more entries in the first log.
Description
PRIORITY[0001]The present patent application is a continuation of and incorporates by reference the corresponding patent application Ser. No. 11 / 677,458, titled, “Trustworthy Timestamps and Certifiable Clocks Using Logs Linked by Cryptographic Hashes,” filed on Feb. 21, 2007.RELATED APPLICATIONS[0002]This application is related to the following applications, U.S. patent application Ser. No. 10 / 887,998, entitled Synchroninzing Distributed Work Through Document Logs, filed on Jul. 9, 2004; U.S. patent application Ser. No. 11 / 323,543, entitled Refining Based on Log Content, filed on Dec. 29, 2005; U.S. patent application Ser. No. 11 / 323,542, entitled Always On and Updated Operation for Document Logs, filed on Dec. 29, 2005; U.S. patent application Ser. No. 11 / 323,629, entitled Log Integrity Verification, filed on Dec. 29, 2005; and U.S. patent application Ser. No. 11 / 514,711, entitled Paper-Based Document Logging, filed on Aug. 31, 2006, assigned to the corporate assignee of the presen...
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Patent Type & Authority Applications(United States)
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